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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reclassifications out of Accumulated Other Comprehensive Income before Tax [Abstract]      
Reclassifications $ 682 $ 1,138 $ 586
Accumulated Defined Benefit Pension Items      
Reclassifications out of Accumulated Other Comprehensive Income before Tax [Abstract]      
Amortization of prior service cost [1] 221 220 219
Amortization of net loss [1] 690 1,312 570
Total reclassifications, before tax - pension and postretirement benefits [1] 911 1,532 789
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent [2] (229) (394) (203)
Total reclassification, net of tax - pension and postretirement benefits 682 1,138 586
Reclassifications $ 682 $ 1,138 $ 586
[1] Amortization of these items is included in "Other (income) expense, net" in the consolidated income statements of both IDACORP and Idaho Power.
[2] The tax benefit is included in "Income tax expense" in the consolidated income statements of both IDACORP and Idaho Power